CN102223641A - Frequency spectrum access method and system based on frequency spectrum cavity nonuniformity - Google Patents

Abstract

The invention discloses frequency spectrum access method and system based on frequency spectrum cavity nonuniformity; the method comprises the following steps: channel capacity corresponding to a frequency spectrum cavity is calculated according to a primary detection result of the frequency spectrum cavity; the frequency spectrum cavity is estimated according to the user demand on the transmission ratio and the channel capacity corresponding to the frequency spectrum cavity, the frequency spectrum cavity which can not meet the user demand on the transmission ratio is eliminated to obtain a check result of the frequency spectrum cavity; an uniform interval of the frequency spectrum cavity accessed by a subordinate user currently is calculated, the frequency spectrum cavity in the uniform interval can be screened out from the check result of the frequency spectrum cavity to obtain a screened sub-result of the frequency spectrum cavity, the frequency spectrum cavity is selected from the screened sub-result of the frequency spectrum cavity and is accessed to the subordinate user; preferentially, the smallest frequency spectrum cavity of the channel capacity is selected, and the subordinate user is accessed to the frequency spectrum cavity with the lowest channel capacity. In the invention, the throughput and frequency spectrum utilization rate of the system can be remarkably improved, and the drop call rate of the subordinate user in the communication process can be greatly reduced.

Description

Frequency spectrum access method and system based on the frequency spectrum cavity-pocket inhomogeneities

Technical field

The present invention relates to the frequency spectrum access technology, relate in particular to a kind of frequency spectrum access method and system based on the frequency spectrum cavity-pocket inhomogeneities.

Background technology

The cognition degree that improves radio characteristic helps improving the utilance of frequency spectrum, and the research of therefore relevant cognitive radio aspect is becoming the focus of this area research in recent years.Current, the research of cognitive radio is not only to rest on theory stage, and IEEE 802.22 working groups all multifactor in conjunction with in the actual environment just is being devoted to putting into effect cognitive radio.All multifactor in, the otherness of frequency spectrum cavity-pocket (or inhomogeneities) is a kind of factor that wherein receives much concern.

People such as C.Peng the otherness of frequency spectrum cavity-pocket is regarded as since main user's business and frequency spectrum cavity-pocket that moving characteristic caused in time with the variation in space, and the time variation and the space-variant of this frequency spectrum cavity-pocket be defined as " frequency spectrum cavity-pocket inhomogeneities ".On this basis, the research of frequency spectrum cavity-pocket inhomogeneities is used to channel selection, frequency spectrum scheduling, dynamic control channel management and the spectrum sharing network etc. that service quality (QoS, Quality of Service) guarantees.Other research about frequency spectrum cavity-pocket comprises that also people such as Miao Ma is defined as the channel inhomogeneities the different of the communication range in different spectral cavity and interference range, and has proposed to stride Mesh network (a kind of wireless mesh network) structure of layer design based on this notion.The notion of channel inhomogeneities also relates to the difference between the non-unified frequency of using, the Packet Error Ratio of different channels in the whole network, and from the difference of user's service rating.

The research in early stage is based on all detected frequency spectrum cavity-pockets and all can be used from the user, but in fact the detected empty existence of part can not provide from the situation of the required capacity of user, therefore can not avoid consequent obstruction and call drop problem effectively.In addition, because the frequency (as the centre frequency of frequency spectrum cavity-pocket) between the frequency spectrum cavity-pocket can differ far away, existing achievement in research is difficult to solve call drop inaccurate because of wireless parameter (mainly be meant the parameter of the wireless environment in the electromagnetic wave propagation environment, for example the building that is subjected in the electromagnetic wave propagation stops the increase that can cause the electromagnetic wave propagation loss) and that the interference strength acute variation causes.These technical problems make and are difficult to improve from the throughput of system and the availability of frequency spectrum.Therefore, how to make and insert appropriate frequency spectrum cavity-pocket from the user and become the technical problem that the frequency spectrum access technology needs to be resolved hurrily.

Summary of the invention

The technical problem that the present invention will solve provides a kind of frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities, make from the user and insert appropriate frequency spectrum cavity-pocket, thereby raising is from the throughput and the availability of frequency spectrum of system.

One aspect of the present invention provides a kind of frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities, and this method comprises: carry out the Preliminary detection result that frequency spectrum detection is obtained frequency spectrum cavity-pocket from the user; Calculate the channel capacity of frequency spectrum cavity-pocket correspondence according to the Preliminary detection result of frequency spectrum cavity-pocket; According to from user's the transmission rate requirements and the channel capacity of frequency spectrum cavity-pocket correspondence frequency spectrum cavity-pocket being assessed, rejecting can not be satisfied the final election result who obtains frequency spectrum cavity-pocket from the frequency spectrum cavity-pocket of user's transmission rate requirements; Calculating is between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user, and filters out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of frequency spectrum cavity-pocket; From the sub-result of the screening of frequency spectrum cavity-pocket, choose frequency spectrum cavity-pocket and access slave user, preferably, choose the frequency spectrum cavity-pocket of channel capacity minimum, and will be from the frequency spectrum cavity-pocket of user's access channel capacity minimum.

Among the embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, this method also comprises: can not satisfy after the frequency spectrum cavity-pocket of user's transmission rate requirements obtains the final election result of frequency spectrum cavity-pocket rejecting, to calculate before between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user; Whether judgement needs to switch frequency spectrum cavity-pocket from the user; If need switch frequency spectrum cavity-pocket, then calculate between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user from the user; Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user.

Among the embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, this method also comprises: from the final election result of frequency spectrum cavity-pocket, filter out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket after, from the sub-result of the screening of frequency spectrum cavity-pocket, choose before the frequency spectrum cavity-pocket of channel capacity minimum; Judge whether the sub-result of screening is empty set; If screening sub-result is empty set, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket then, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user; Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in the sub-result of the screening of frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the sub-result of screening from the user.

Among the embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, this method is according to the Preliminary detection result of frequency spectrum cavity-pocket, calculates the channel capacity of frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor.

Among the embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, the channel capacity of this method by the frequency spectrum cavity-pocket correspondence asked the mode of partial derivative to frequency, calculates between the residing homogeneity range of centre frequency of the frequency spectrum cavity-pocket of the current access of user.

Another aspect of the present invention provides a kind of frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities, this system comprises: the frequency spectrum detection module, be used to carry out frequency spectrum detection, obtain the Preliminary detection result of frequency spectrum cavity-pocket, and the Preliminary detection result is sent to the channel capacity computing module; The channel capacity computing module is used for the Preliminary detection result that the received spectrum detection module sends, and calculates the channel capacity of frequency spectrum cavity-pocket correspondence according to the Preliminary detection result; And the channel capacity of frequency spectrum cavity-pocket correspondence sent to the frequency spectrum cavity-pocket evaluation module; The frequency spectrum cavity-pocket evaluation module, be used for the channel capacity that receive channel calculation of capacity module sends, according to transmission rate requirements and channel capacity from the user frequency spectrum cavity-pocket is assessed, rejecting can not be satisfied frequency spectrum cavity-pocket from user's transmission rate requirements to obtain the final election result of frequency spectrum cavity-pocket; And the final election result sent to computing module between homogeneity range; Computing module between homogeneity range, be used for the final election result that received spectrum cavity evaluation module sends, calculating is between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user, and filters out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result; And will screen sub-result and send to the frequency spectrum cavity-pocket access module; The frequency spectrum cavity-pocket access module, be used to receive the sub-result of screening that computing module sends between homogeneity range, from screen sub-result, choose frequency spectrum cavity-pocket and access slave user, preferably, choose the frequency spectrum cavity-pocket of channel capacity minimum, and will be from the frequency spectrum cavity-pocket of user's access channel capacity minimum.

Among the embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, this system also comprises: frequency spectrum cavity-pocket switching judging module, be used for rejecting and satisfy after the frequency spectrum cavity-pocket of user's transmission rate requirements obtains the final election result of frequency spectrum cavity-pocket at the frequency spectrum cavity-pocket evaluation module, the final election result is sent between homogeneity range before the computing module, judge whether need to switch frequency spectrum cavity-pocket from the user; If need switch frequency spectrum cavity-pocket, then calculate between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user by computing module between homogeneity range from the user; Otherwise,, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user by the frequency spectrum cavity-pocket of frequency spectrum cavity-pocket access module selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket.

Among the embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, this system also comprises: frequency spectrum cavity-pocket switching judging module, be used between homogeneity range computing module and filter out frequency spectrum cavity-pocket in being between homogeneity range with after the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of frequency spectrum cavity-pocket, to screen sub-result and send to before the frequency spectrum cavity-pocket access module, judge whether the sub-result of screening is empty set; If screening sub-result is empty set,, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user then by the frequency spectrum cavity-pocket of frequency spectrum cavity-pocket access module selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket; Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in by the sub-result of screening of frequency spectrum cavity-pocket access module frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the sub-result of screening from the user.

Among the embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, the channel capacity computing module is further used for the Preliminary detection result according to frequency spectrum cavity-pocket, calculates the channel capacity of frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor.

Among the embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, the channel capacity that computing module is further used for by the frequency spectrum cavity-pocket correspondence between homogeneity range is asked the mode of partial derivative to frequency, calculates between the residing homogeneity range of centre frequency of the frequency spectrum cavity-pocket of the current access of user.

The invention provides a kind of frequency spectrum access method and system based on the frequency spectrum cavity-pocket inhomogeneities, carrying out having considered when frequency spectrum inserts that the inhomogeneities of frequency spectrum cavity-pocket is to the influence that brings from telex network, the suitable frequency spectrum cavity-pocket of selection inserts from the frequency spectrum cavity-pocket of user's transmission rate requirements satisfying, neither cause the waste of frequency spectrum cavity-pocket capacity, can satisfy transmission rate requirements again from the user.Further, from satisfying the frequency spectrum cavity-pocket of from the frequency spectrum cavity-pocket of user's transmission rate requirements, choosing the channel capacity minimum, help significantly improving the throughput and the availability of frequency spectrum, thereby reduce the cutting off rate from the telex network process greatly from system.

Description of drawings

Fig. 1 illustrates interference temperature model schematic diagram in the prior art;

The flow chart of Fig. 2 illustrates that the embodiment of the invention provides a kind of frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities;

Fig. 3 illustrates single user's scene among the present invention (i.e. main user with from the user mutually under the mutual interference) to the impact analysis schematic diagram from system emission power;

Fig. 4 illustrates multi-user's scene among the present invention (be a plurality of main users with a plurality of from the user mutually under the mutual interference) to the impact analysis schematic diagram from system emission power;

Fig. 5 illustrates schematic diagram between the residing homogeneity range of centre frequency of the frequency spectrum cavity-pocket of the current use of user among the present invention;

Fig. 6 illustrates the flow chart of another embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention;

Fig. 7 illustrates the flow chart of another embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention;

Fig. 8 illustrates the flow chart of the specific embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention;

The structural representation of Fig. 9 illustrates that the embodiment of the invention provides a kind of frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities;

Figure 10 is the structural representation of another embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention.

Embodiment

The present invention pays close attention to frequency spectrum cavity-pocket by from (the SS of system, Secondary System) difference in is from user (SU, Secondary User) otherness of using frequency spectrum cavity-pocket time-frequency spectrum cavity to embody, it is the inhomogeneities of frequency spectrum cavity-pocket, specifically, the factor that the frequency spectrum cavity-pocket inhomogeneities relates generally to comprise frequency, communication environments and main system (PS, PrimarySystem), from interference of system etc.Time variation, the space-variant of the frequency spectrum cavity-pocket that the frequency spectrum cavity-pocket inhomogeneities also relates to main user (PU, Primary User) on the frequency spectrum cavity-pocket, cause from features such as user's business, position distribution, and disturbing factor etc. mutually between the principal and subordinate user.

Frequency spectrum cavity-pocket inhomogeneities factor: frequency propagation characteristic

The electromagnetic wave propagation loss is presented as the result of all mechanism of transmission and communication environments comprehensive function, as shown in Equation (1):

$P_{\mathrm{SR}}=K\×\frac{P_{\mathrm{ST}}}{d^m\×f^n},m,n\≥2---\left(1\right)$

Wherein, P _SRBe the received power from system receiver (SR, Secondary Receiver), d is from the distance between system's transceiver, and f represents the detected frequency spectrum cavity-pocket centre frequency from system, P _STBe the transmitting power from system transmitter (ST, Secondary Transmitter), K is from path loss constant between user transceiver, and m and n are respectively path loss index and frequency loss index, and its value is by concrete environment decision.

Shown in formula (1), relevant with transceiver distance, transmitting power, carrier frequency respectively with communication environments from system's received signal intensity.Wherein transceiver distance and transmitting power be by from default, and carrier frequency and communication environments are subjected to the influence of selected frequency spectrum cavity-pocket and applied environment respectively.The present invention pays close attention to the influence that frequency and communication environments are produced emphatically.

Frequency values is the most basic parameter of frequency spectrum cavity-pocket, the corresponding unique frequency value in different spectral cavity.The variation of frequency can influence the loss that signal is propagated, and further influence is from the use of system to frequency spectrum cavity-pocket.Frequency factor influences in the formula (1) two parameter f and n.Under the constant situation of transceiver relative distance, frequency is high more, and the loss of signal that receives is big more, and received signal intensity is low more.The centre frequency of frequency spectrum cavity-pocket can differ greatly, and therefore needs to consider the frequency influence that transmission causes to signal.N is subjected to the rule of frequency change influence, need be at the relationship analysis of different circulation ways and frequency.The electromagnetic wave propagation mode mainly contains direct projection, reflection, diffraction and penetrates etc.The contrast relationship of frequency and circulation way is as shown in table 1:

Circulation way	Frequency range	?n
			Direct projection	Be not subjected to frequency limitation	Be considered as constant
Reflection	Be not subjected to frequency limitation	Be considered as constant

Diffraction	The following electromagnetic diffraction of 15GHz clearly, the electromagnetic wave behind the diffraction can be used as a propagation path; But the effect of electromagnetic wave diffraction is similar to the effect of reflection when frequency is higher than 15GHz	F is below 15GHz, and n is considered as constant; F＞15GHz, n increases suddenly
			Penetrate	Electromagnetic wave penetrate medium and in medium the coefficient result of loss, 10GHz is almost nil to the penetration depth of the different face of land of humidity, seawater and pure water with upper frequency	F is below 10GHz, and n is considered as constant; F＞10GHz, n increases suddenly

The corresponding relation of different circulation ways of table 1 and frequency

Communication environments has influence on the degree of loss in the radio signal propagation process.The laser propagation effect that same frequency spectrum cavity-pocket uses in different communication environments has difference, and this also has influence on the selection to frequency spectrum cavity-pocket from system.In addition, the propagation path between the transceiver may be blocked, as building and massif and trees vegetation etc.The comprehensive function of these factors forms line-of-sight transmission (LOS, Line Of Sight) and non line of sight transmission (NLOS, Non Line OfSight).The path loss index m of LOS environment is little than the NLOS environment.

Frequency spectrum cavity-pocket inhomogeneities factor: main user characteristics

The factor that influences the frequency spectrum cavity-pocket inhomogeneities also relates to main user characteristics, and as main user's business, position distribution etc., described main user characteristics is from one of important evidence of system assignment frequency spectrum cavity-pocket.In main user's feature, the processing method of mainly paying close attention to from system that is main user to disturbing is especially to the processing method of the interference that produces from the user.The model of the interference temperature that FCC (FCC, Federal Communications Commission) proposes is widely accepted processing method.Fig. 1 illustrates interference temperature model schematic diagram in the prior art.As shown in Figure 1, interference temperature model requires on additional interference that the user produced and this frequency spectrum cavity-pocket original interference sum to be lower than the interference temperature thresholding (threshold value) of main receiver user.Promptly the additional interference that produces from the user is subjected to the restriction of main user's interference temperature thresholding and original interference.Therefore need consider two aspect factors from the user: guarantee that additional interference and original interference sum are lower than main user's interference temperature thresholding on the one hand, the interference that guarantees on the other hand to receive is in user's tolerance range.

With exemplary embodiment of the present invention the present invention is described more fully and illustrates with reference to the accompanying drawings.

The flow chart of Fig. 2 illustrates that the embodiment of the invention provides a kind of frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities.

As shown in Figure 2, comprise step 202, carry out the Preliminary detection result that frequency spectrum detection is obtained frequency spectrum cavity-pocket from the user based on the frequency spectrum access method of frequency spectrum cavity-pocket inhomogeneities.For example,, and form the Preliminary detection result, also can be referred to as selected works (P-Set, Prior Set) just from user's current frequency spectrum cavity-pocket that can be used for inserting that provides of detection system at first.The method that those skilled in the art know the frequency spectrum detection of common employing mainly comprises detection methods such as matched filter detection, cyclostationarity detection, energy measuring; For known main subscriber signal, adopting matched filter to detect is the optimal selection of transmitter detection method; The energy measuring method is the simplification of matched filter detection method, is that the suboptimum that transmitter detects is selected; The energy measuring computation complexity is lower, and does not need to know the physical layer and the media access control layer information of main system, for example modulation type and order, shaping pulse, packet format etc.Concrete detection implementation method can be controlled " Research on Cognitive Radio Technology " delivered in 2007 the 3rd phases " communication technology " referring to the Tan Xue of Research on Communication Technology institute of Harbin Institute of Technology.

Step 204 is calculated the channel capacity of frequency spectrum cavity-pocket correspondence according to the Preliminary detection result of frequency spectrum cavity-pocket.For example, according to aforementioned Preliminary detection as a result P-Set calculate the channel capacity of each frequency spectrum cavity-pocket correspondence respectively, can calculate by Shannon's theorems from user or the channel capacity C that frequency spectrum cavity-pocket obtained that uses from system, as shown in Equation (2).

$C={B\log }_2(1+\frac{P}{{\mathrm{BN}}_0})b/s---\left(2\right)$

Wherein, P is an average transmitting power, is from user's received signal power P in the actual propagation environment _SR, N ₀Be the white noise power spectral density, b is bit " bit ", and s is second " second ".

Next the optimal way of the channel capacity of calculating the frequency spectrum cavity-pocket correspondence is briefly introduced.Preferably, according to the Preliminary detection result of frequency spectrum cavity-pocket, and calculate the channel capacity of frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor.

Specifically, when considering that frequency factor and communication environments factor are calculated the channel capacity of frequency spectrum cavity-pocket, formula (3) will be obtained in aforementioned formula (1) the substitution formula (2); Shown in specific as follows:

$C={B\log }_2(1+\frac{K\×P_{\mathrm{ST}}}{d^m\×f^n\×{\mathrm{BN}}_0})b/s---\left(3\right)$

Influence considering the channel capacity that disturbing factor can provide frequency spectrum cavity-pocket at first needs the analysis of disturbing.Specifically, interference temperature mechanism is used to limit the interference that main system is produced from system, and the relation of interference signal intensity is as shown in Equation (4) around interference temperature and the main system receiver:

T＝P _I/kB (4)

Wherein, T is the main system interference temperature, and k is a Boltzmann constant, and B represents the bandwidth of frequency spectrum cavity-pocket, the main system power P that is interfered _IAs shown in Equation (5):

P _I＝P _{I_additional}+P _{I_original} (5)

Wherein, P _{I_additional}Be the additional interference of using frequency spectrum cavity-pocket that main user is caused from system, P _{I_original}Be the original interference on the frequency spectrum cavity-pocket.

Fig. 3 illustrates single user's scene among the present invention (i.e. main user with from the user mutually under the mutual interference) to the impact analysis schematic diagram from system emission power.As shown in Figure 3, main user is with transmitting power P _PTF outwards transmits by frequency spectrum cavity-pocket, and the interference strength that is subjected to main user from the user is I _{F_SU}Therefore, P _{I_additional}With I _{F_SU}Satisfy formula (6), specific as follows shown in:

$\left\{\begin{array}{c}{P}_{I_{-}\mathrm{additional}}=K\×\frac{P_{\mathrm{ST}}}{d^m\×f^n}\\ I_{f_{-}\mathrm{SU}}=K\×\frac{P_{\mathrm{PT}}}{d^m\×f^n}\end{array}\right.m,n\≥2---\left(6\right)$

Obtain from user emission power P according to formula (6) _STBe that it embodies formula as shown in Equation (7):

$P_{\mathrm{ST}}=\frac{P_{\mathrm{PT}}\×P_{I_{-}\mathrm{additional}}}{I_{f_{-}\mathrm{SU}}}---\left(7\right)$

Wherein, T _ThBe main user's interference temperature thresholding, P _ThBe detection threshold from the user; As shown in Figure 3, interference temperature thresholding T _ThCharacterized the maximum interference intensity that main user can bear, should guarantee that from system communication the interference temperature of main system is lower than T _ThAs frequency spectrum cavity-pocket, to be lower than detection threshold P from the user from the detected main user's of user interference _ThTherefore, the boundary condition of formula (7) is as follows:

$\left\{\begin{array}{c}{I}_{f_{-}\mathrm{SU}}\≤P_{\mathrm{th}}\\ P_{I_{-}\mathrm{additional}}\≤T_{\mathrm{th}}\×\mathrm{kB}-P_{I_{-}\mathrm{original}}\end{array}\right.---\left(8\right)$

Fig. 4 illustrates multi-user's scene among the present invention (be a plurality of main users with a plurality of from the user mutually under the mutual interference) to the impact analysis schematic diagram from system emission power.As shown in Figure 4, under multi-user's scene, each signal from user emission can arrive all main users and form interference, so formula (6) correspondingly is revised as formula (9), specific as follows shown in:

$\left\{\begin{array}{c}{P}_{I_{-}\mathrm{additional}}^{i,j}\left(i\right)=K(i,j)\×\frac{P_{\mathrm{ST}}\left(j\right)}{{\left(d(i,j)\right)}^{m(i,j)}\×f^n}\\ I_{f_{-}\mathrm{SU}}(i,j)=K(i,j)\×\frac{P_{\mathrm{PT}}\left(i\right)}{{\left(d(i,j)\right)}^{m(i,j)}\×f^n}\end{array}\right.,m,n\≥2---\left(9\right)$

The corresponding boundary condition of formula (9) is as shown in Equation (10):

$\left\{\begin{array}{c}\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{P}_{I_{-}\mathrm{additional}}^{i,j}=T\left(i\right)\×\mathrm{kB}-P_{I_{-}\mathrm{original}}\left(i\right)\\ \underset{j=1}{\overset{N}{\mathrm{\Σ}}}{P}_{I_{-}\mathrm{additional}}^{i,j}\≤T_{\mathrm{th}}\×\mathrm{kB}-P_{I_{-}\mathrm{original}}\left(i\right)\\ \underset{i=1}{\overset{L}{\mathrm{\Σ}}}{I}_{f_{-}\mathrm{SU}}(i,j)\≤P_{\mathrm{th}}\left(j\right)\end{array}\right.---\left(10\right)$

Wherein, j ∈ [1, N] and i ∈ [1, L] represent respectively different from user and main user, N be in certain geographic range frequency of utilization f as frequency spectrum cavity-pocket from number of users (for example in radius is the zone of 1km, if use identical frequency spectrum cavity-pocket from the user, influence each other from producing between the user so, if and outside 100km one also use the same frequency spectrum cavity-pocket from the user, owing to not in the regional extent of influence, so just be not considered; Concrete distance values is to determine according to the wireless environment from user's transmitting power, only does illustrating here), L is the pairing main number of users of f for authorizing frequency.

Every group of equation two formula in the formula (9) are divided by promptly obtains transmitting power from the user, specific as follows shown in:

$P_{\mathrm{ST}}\left(j\right)=\frac{1}{N\×L}\×\underset{i=1}{\overset{L}{\mathrm{\Σ}}}{P}_{\mathrm{PT}}\left(i\right)\×\frac{P_{I_{-}\mathrm{additional}}^{i,j}\left(i\right)}{I_{f_{-}\mathrm{SU}}(i,j)}---\left(11\right)$

Frequency spectrum cavity-pocket adds from the computing formula (3) of system channel capacity in the interference strength of current geospatial location, obtains formula (12), specific as follows shown in:

$C={B\log }_2(1+\frac{K\×P_{\mathrm{ST}}}{d^m\×f^n\×I_{f_{-}\mathrm{CR}}})b/s---\left(12\right)$

Formula (7) substitution formula (12) is obtained channel capacity under single user's scene, as shown in Equation (13):

$C={B\log }_2(1+\frac{K\×P_{\mathrm{PT}}\×P_{I_{-}\mathrm{additional}}}{d^m\×f^n\×(I_{f_{-}\mathrm{SU}}+{\mathrm{BN}}_0)\×I_{f_{-}\mathrm{SU}}})b/s--\left(13\right)$

Formula (9) substitution formula (12) is obtained channel capacity under multi-user's scene, as shown in Equation (14):

$C\left(j\right)={B\log }_2(1+\frac{K(i,j)\×\underset{z=1}{\overset{L}{\mathrm{\Σ}}}{P}_{\mathrm{PT}}\left(i\right)\×\frac{P_{I_{-}\mathrm{additional}}^{i,j}\left(i\right)}{I_{f_{-}\mathrm{SU}}(i,j)}}{N\×L\×d{(i,j)}^{m(i,j)}\×f^n\×(I_{f_{-}\mathrm{SU}}\left(j\right)+{\mathrm{BN}}_0)})b/s---\left(14\right)$

Formula (14) has characterized the difference of the channel capacity of frequency spectrum cavity-pocket inhomogeneities generation, therefrom those skilled in the art can know: have different principal and subordinate's user distribution situations for different frequencies, cause the different capacity property of there are differences of using same frequency spectrum cavity-pocket to obtain from the user.

Step 206, according to from user's the transmission rate requirements and the channel capacity of frequency spectrum cavity-pocket correspondence frequency spectrum cavity-pocket being assessed, rejecting can not be satisfied the final election result who obtains frequency spectrum cavity-pocket from the frequency spectrum cavity-pocket of user's transmission rate requirements.For example, according to transmission rate requirements from the user, and the channel capacity of each frequency spectrum cavity-pocket correspondence of aforementioned Practical Calculation, each frequency spectrum cavity-pocket is assessed, get rid of from first selected works P-Set thereby can not satisfy from the frequency spectrum cavity-pocket of user's transmission rate requirements, remaining frequency spectrum cavity-pocket is formed the final election result, also can be referred to as final election collection (E-Set, Evolution Set).

Step 208 is calculated between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user, and filters out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of frequency spectrum cavity-pocket.Specifically, for needs switch frequency spectrum cavity-pocket from the user, not only to satisfy from the user transmission rate requirements, need also to guarantee that the target spectrum cavity of switching is close with the frequency of current frequency spectrum cavity-pocket of serving.Because the inaccurate and too high interference level of wireless parameter is the main cause that causes the frequency spectrum cavity-pocket handoff failure, if the target spectrum cavity differs bigger with the frequency of the frequency spectrum cavity-pocket of current service, path loss model will change, and carry out the frequency spectrum cavity-pocket switching this moment and just may cause the wireless environment estimation of carrying out from the user to produce than big difference.And under the situation that frequency differs greatly before and after the frequency spectrum cavity-pocket switching, factors such as Doppler frequency shift can not be out in the cold.In addition, because the mandate frequency range of main system is that feature such as continuous, the close pairing main user's of frequency spectrum cavity-pocket business, distribution is comparatively approaching probably mostly; Therefore, the reliability of the frequency spectrum cavity-pocket that frequency is close is greater than the reliability of the frequency spectrum cavity-pocket of frequency spectrum apart from each other.And because the change of main user characteristics may cause receiving main user's interference level than big before from the user that this also is one of reason that causes handoff failure.Therefore, switching the user takes place to need to carry out the selection of frequency in the process that frequency spectrum cavity-pocket inserts.

Next the optimal way of the channel capacity of calculating the frequency spectrum cavity-pocket correspondence is briefly introduced.Preferably, calculating is between the residing homogeneity range of centre frequency of the frequency spectrum cavity-pocket of the current access of user.Computational methods between homogeneity range have multiple, determine that this interval purpose is to reduce to switch the frequency spectrum cavity-pocket failed probability.

Among the embodiment of the calculating between homogeneity range provided by the invention, ask the mode of partial derivative to calculate to frequency by the channel capacity of frequency spectrum cavity-pocket correspondence.Specifically, aforementioned formula (8) got equation after, can obtain the heap(ed) capacity that frequency spectrum cavity-pocket can provide under single user's scene in the substitution formula (7), specifically as shown in Equation (15):

$C={B\log }_2(1+\frac{K\×P_{\mathrm{PT}}\×T_{\mathrm{th}}\×\mathrm{kB}}{d^m\×f^n\×(I_{f_{-}\mathrm{SU}}+{\mathrm{BN}}_0)\×I_{f_{-}\mathrm{SU}}})b/s---\left(15\right)$

As a rule,

Calculating difficulty relatively, this is because K, m and n are the functions of frequency spectrum cavity-pocket frequency f, and changes with the variation of f.Yet within a short period of time, the variation of communication environment can be ignored, so m and K can be regarded as constant.The frequency of existing wireless system is mostly below 10GHz, so n also can regard constant as.I _{F_SU}, N ₀And P _PTDepend on principal and subordinate user's geographical distribution, therefore in computational process, also can be reduced to constant.Thus, the channel capacity that we obtain frequency spectrum cavity-pocket is asked the expression formula of partial derivative to frequency, as shown in Equation (16):

$\frac{\∂C}{\∂f}=\frac{K\×P_{\mathrm{PT}}\×T_{\mathrm{th}}\×k\×B\×(-n)}{\ln 2\×[d^m\×(I_{f_{-}\mathrm{SU}}+{\mathrm{BN}}_0)\×I_{f_{-}\mathrm{SU}}\×f^{n+1}+K\×P_{\mathrm{PT}}\×T_{\mathrm{th}}\×k\×B\×f]}b/s---\left(16\right)$

According to aforementioned formula (16), calculating should be pairing from user's transmission rate requirements

And then obtain frequency range between the residing homogeneity range of this frequency spectrum cavity-pocket centre frequency.

Fig. 5 illustrates schematic diagram between the residing homogeneity range of centre frequency of the frequency spectrum cavity-pocket of the current use of user among the present invention.As shown in Figure 5, wherein, f ₀The centre frequency of representing the frequency spectrum cavity-pocket of the current use of this user, [f ₁, f ₂] be

Scope between the homogeneity range of decision;

Be the value of current local derviation,

The local derviation scope that thresholding determined for partial derivative that is to say

Since reality from system

Be not dull, therefore, the curve shown in Fig. 5 may not be dull also, that is to say, may exist a plurality of frequency separations to satisfy

Requirement, so will can obtain between correct homogeneity range, for example determine between homogeneity range according to the restriction that adds (Δ f) th from user's transmission rate requirements in the restriction that transverse axis adds the frequency change thresholding.

Among another embodiment of calculating between homogeneity range provided by the invention, the channel capacity by the frequency spectrum cavity-pocket correspondence is calculated with the mode from the difference of user's transmission rate requirements.Specifically, calculate the channel capacity of frequency spectrum cavity-pocket according to aforementioned formula (15), and set threshold delta C between a homogeneity range _ThΔ C _ThWith from user's transmission rate requirements R _SUrequireScope [the R of empty capacity in forming between a homogeneity range together _SUrequire-Δ C _Th, R _SUrequire+ Δ C _Th].From frequency spectrum cavity-pocket final election result the frequency spectrum cavity-pocket of selection capacity in this scope as homogeneity range between the screening sub-result.If the result is empty set, then from frequency spectrum cavity-pocket Preliminary detection result, choose frequency spectrum cavity-pocket in this scope once more as the sub-result of the screening between homogeneity range.

And, it can be considered as the combination of a plurality of single user's scenes for multi-user's scene; The more single user's scene of derivation between its homogeneity range numerous and diverse, multi-user's scene will be carried out the particular problem concrete analysis on the basis of single user's scene analysis, but its principle is identical with single user's scene, and used method roughly is the same in the time of analysis.

Step 210 is chosen the frequency spectrum cavity-pocket of suitable channel capacity from the sub-result of the screening of frequency spectrum cavity-pocket, and inserts the frequency spectrum cavity-pocket of respective channel capacity from the user.For example, screen in the end from the user that the suitable frequency spectrum cavity-pocket of selection inserts the sub-result, can satisfy self message capacity demand; Through the screening of aforementioned flow process, the child intermediate frequency spectrum as a result of described screening cavity can both be satisfied from the demand of telex network capacity, therefore, selects suitable frequency spectrum cavity-pocket can be understood as and therefrom selects any one frequency spectrum cavity-pocket to switch access.Preferably, implement the most proper selection principle (APP-Selection, Appropriate Selection; Promptly select the frequency spectrum cavity-pocket of capacity minimum in the frequency spectrum cavity-pocket set) choose the frequency spectrum cavity-pocket of channel capacity minimum among the sub-result of screening as access cavity from the user.

Frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, carrying out having considered when frequency spectrum inserts that the inhomogeneities of frequency spectrum cavity-pocket is to the influence that brings from telex network, the suitable frequency spectrum cavity-pocket (preferably choosing the frequency spectrum cavity-pocket of channel capacity minimum) of selection inserts from the frequency spectrum cavity-pocket of user's transmission rate requirements satisfying, neither cause the waste of frequency spectrum cavity-pocket capacity, can satisfy transmission rate requirements again from the user.Those skilled in the art can clearly know according to instruction of the present invention, frequency spectrum access scheme based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, help significantly improving the throughput and the availability of frequency spectrum, thereby reduce the cutting off rate from the telex network process greatly from system.

Fig. 6 illustrates the flow chart of another embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention.

As shown in Figure 6, frequency spectrum access method flow process 600 based on the frequency spectrum cavity-pocket inhomogeneities comprises: step 602-612, wherein step 602-606,608 and 610 can carry out the same or analogous technology contents with step 202-210 shown in Figure 2 respectively, for for purpose of brevity, repeat no more its technology contents here.

As shown in Figure 6, at " rejecting can not be satisfied the final election result who obtains frequency spectrum cavity-pocket from the frequency spectrum cavity-pocket of user's transmission rate requirements " of step 606 afterwards, step 608 " calculating between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user " before, execution in step 607 judges whether need to switch frequency spectrum cavity-pocket from the user.If need switch frequency spectrum cavity-pocket from the user, then execution in step 608; Otherwise, execution in step 612.

Step 612, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user.Specifically, because different frequency spectrum cavity-pockets can be given the channel capacity difference of bringing from the user, therefore in the process that frequency spectrum inserts, need can the channel capacity of frequency spectrum cavity-pocket be satisfied from the criterion of user's user demand as this frequency spectrum cavity-pocket.When being new user for the user who implements the frequency spectrum cavity-pocket access, only need to guarantee that the capacity requirement that the frequency spectrum cavity-pocket that is inserted can satisfy this user gets final product, and need not as switching user's (not only will satisfy from the user transmission rate requirements, also need to guarantee the close requirement of frequency of target spectrum cavity of switching and the frequency spectrum cavity-pocket of serving).Based on aforementioned reason, when from the user being the new user (non-switching user) who inserts, then select suitable frequency spectrum cavity-pocket to insert among the E-Set as a result in final election, because the frequency spectrum cavity-pocket that will not satisfy capacity requirement in step 606 has been got rid of, therefore the frequency spectrum cavity-pocket of choosing among the E-Set as a result in final election can both satisfy the transmission rate requirements from the user.Preferably, implement the frequency spectrum cavity-pocket that the most proper selection principle APP-Selection chooses the channel capacity minimum, can either satisfy transmission rate requirements, do not cause the waste of capacity again from the user.

Frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, in that being assessed and reject, can not satisfy behind the frequency spectrum cavity-pocket of user's transmission rate requirements frequency spectrum cavity-pocket, whether judgement needs to switch frequency spectrum cavity-pocket from the user, according to being newly to insert the user or to be switched from different The selection result, choose suitable frequency spectrum cavity-pocket from the user and insert from the user, thereby significantly improve the throughput and the availability of frequency spectrum, reduce the cutting off rate from the telex network process greatly from system.

Fig. 7 illustrates the flow chart of another embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention.

As shown in Figure 7, frequency spectrum access method flow process 600 based on the frequency spectrum cavity-pocket inhomogeneities comprises: step 702-712, wherein step 702-708 and 710 can carry out the same or analogous technology contents with step 202-210 shown in Figure 2 respectively, for for purpose of brevity, repeats no more its technology contents here.

As shown in Figure 7, " from the final election result of frequency spectrum cavity-pocket, filter out in being between homogeneity range frequency spectrum cavity-pocket with the sub-result of the screening of obtaining frequency spectrum cavity-pocket " of step 708 afterwards, step 710 " choosing the frequency spectrum cavity-pocket of channel capacity minimum from the sub-result of the screening of frequency spectrum cavity-pocket " before, execution in step 709 judges whether the sub-result of screening is empty set.If screening sub-result is empty set, then execution in step 712; Otherwise, execution in step 710.

Step 712, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user.Specifically, be empty set if screen child Sub-Set as a result, also just mean the frequency spectrum cavity-pocket that does not meet the demands in calculating between resulting homogeneity range through step 708; The frequency spectrum cavity-pocket of choosing among the E-Set as a result in final election can both satisfy the transmission rate requirements from the user so.Preferably, implement the frequency spectrum cavity-pocket that the most proper selection principle APP-Selection chooses the channel capacity minimum, can either satisfy transmission rate requirements, do not cause the waste of capacity again from the user.

Frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, from the final election result of frequency spectrum cavity-pocket, filter out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket after, judge whether the sub-result of last screening is empty set, and from different The selection result, choose suitable frequency spectrum cavity-pocket according to judged result and insert, thereby significantly improve the throughput and the availability of frequency spectrum, reduce the cutting off rate from the telex network process greatly from system.

Fig. 8 illustrates the flow chart of the specific embodiment of the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention.

As shown in Figure 8, comprise step 802, carry out the Preliminary detection result that frequency spectrum detection is obtained frequency spectrum cavity-pocket from the user based on the frequency spectrum access method of frequency spectrum cavity-pocket inhomogeneities.For example,, and form the Preliminary detection result, also can be referred to as selected works (P-Set, Prior Set) just from user's current frequency spectrum cavity-pocket that can be used for inserting that provides of detection system at first.

Step 804 is calculated the channel capacity of frequency spectrum cavity-pocket correspondence according to the Preliminary detection result of frequency spectrum cavity-pocket.For example, according to aforementioned Preliminary detection as a result P-Set calculate the channel capacity of each frequency spectrum cavity-pocket correspondence respectively, can calculate by Shannon's theorems from the user or from the channel capacity C that frequency spectrum cavity-pocket obtained that system uses, preferably, according to the Preliminary detection result of frequency spectrum cavity-pocket, and calculate the channel capacity of frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor; Concrete computational methods just repeat no more here referring to the detailed introduction in the abovementioned steps 204.

Step 806, according to from user's the transmission rate requirements and the channel capacity of frequency spectrum cavity-pocket correspondence frequency spectrum cavity-pocket being assessed, rejecting can not be satisfied the final election result who obtains frequency spectrum cavity-pocket from the frequency spectrum cavity-pocket of user's transmission rate requirements.For example, according to transmission rate requirements from the user, and the channel capacity of each frequency spectrum cavity-pocket correspondence of aforementioned Practical Calculation, each frequency spectrum cavity-pocket is assessed, get rid of from first selected works P-Set thereby can not satisfy from the frequency spectrum cavity-pocket of user's transmission rate requirements, remaining frequency spectrum cavity-pocket is formed the final election result, also can be referred to as final election collection (E-Set, Evolution Set).

Step 807 judges whether need to switch frequency spectrum cavity-pocket from the user.Specifically, because different frequency spectrum cavity-pockets can be given the channel capacity difference of bringing from the user, therefore in the process that frequency spectrum inserts, need can the channel capacity of frequency spectrum cavity-pocket be satisfied from the criterion of user's user demand as this frequency spectrum cavity-pocket.When being new user for the user who implements the frequency spectrum cavity-pocket access, only need to guarantee that the capacity requirement that the frequency spectrum cavity-pocket that is inserted can satisfy this user gets final product, and need not as switching user's (not only will satisfy from the user transmission rate requirements, also need to guarantee the close requirement of frequency of target spectrum cavity of switching and the frequency spectrum cavity-pocket of serving); Therefore, execution in step 807 after step 806, according to being newly to insert the user from the user, then execution in step 812; If have switch the frequency spectrum cavity-pocket demand from the user, then execution in step 808.

Step 808 is calculated between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user, and filters out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of frequency spectrum cavity-pocket.Specifically, for needs switch frequency spectrum cavity-pocket from the user, not only to satisfy from the user transmission rate requirements, need also to guarantee that the target spectrum cavity of switching is close with the frequency of current frequency spectrum cavity-pocket of serving.Because the inaccurate and too high interference level of wireless parameter is the main cause that causes the frequency spectrum cavity-pocket handoff failure, if the target spectrum cavity differs bigger with the frequency of the frequency spectrum cavity-pocket of current service, path loss model will change, and carry out the frequency spectrum cavity-pocket switching this moment and just may cause the wireless environment estimation of carrying out from the user to produce than big difference.And under the situation that frequency differs greatly before and after the frequency spectrum cavity-pocket switching, factors such as Doppler frequency shift can not be out in the cold.In addition, because the mandate frequency range of main system is that feature such as continuous, the close pairing main user's of frequency spectrum cavity-pocket business, distribution is comparatively approaching probably mostly; Therefore, the reliability of the frequency spectrum cavity-pocket that frequency is close is greater than the reliability of the frequency spectrum cavity-pocket of frequency spectrum apart from each other.Therefore, switching the user takes place to need to carry out the selection of frequency in the process that frequency spectrum cavity-pocket inserts; Concrete computational methods just repeat no more here referring to the detailed introduction in the abovementioned steps 208.

Step 809 judges whether the sub-result of screening is empty set.If screening sub-result is empty set, then execution in step 812; Otherwise, execution in step 810.

Step 810 is chosen the frequency spectrum cavity-pocket of channel capacity minimum from the sub-result of the screening of frequency spectrum cavity-pocket, and from the frequency spectrum cavity-pocket of user's access channel capacity minimum.For example, in the end screen the most proper selection principle of enforcement (APP-Selection, Appropriate Selection the sub-result from the user; Promptly select the frequency spectrum cavity-pocket of capacity minimum in the frequency spectrum cavity-pocket set) choose the frequency spectrum cavity-pocket of channel capacity minimum among the sub-result of screening as access cavity from the user.

Step 812, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user.Specifically, be empty set if screen child Sub-Set as a result, also just mean the frequency spectrum cavity-pocket that does not meet the demands in calculating between resulting homogeneity range through step 808; Implement the most proper selection principle APP-Selection so, choose the frequency spectrum cavity-pocket of channel capacity minimum as a result among the E-Set, can either satisfy transmission rate requirements, do not cause the waste of capacity again from the user in final election.

The structural representation of Fig. 9 illustrates that the embodiment of the invention provides a kind of frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities.

As shown in Figure 9, a kind of frequency spectrum connecting system 900 based on the frequency spectrum cavity-pocket inhomogeneities comprises: computing module 908 and frequency spectrum cavity-pocket access module 910 between frequency spectrum detection module 902, channel capacity computing module 904, frequency spectrum cavity-pocket evaluation module 906, homogeneity range.

Wherein, frequency spectrum detection module 902 is used to carry out frequency spectrum detection, and obtains the Preliminary detection result of frequency spectrum cavity-pocket.For example, the frequency spectrum detection module is the current frequency spectrum cavity-pocket that can be used for inserting that can provide of detection system at first, forms the Preliminary detection result, also can be referred to as selected works (P-Set just, Prior Set), and with the Preliminary detection result send to channel capacity computing module 904.

Channel capacity computing module 904 is used for the Preliminary detection result that received spectrum detection module 902 sends, and calculates the channel capacity of frequency spectrum cavity-pocket correspondence according to the Preliminary detection result of frequency spectrum cavity-pocket; And the channel capacity of frequency spectrum cavity-pocket correspondence sent to frequency spectrum cavity-pocket evaluation module 906.For example, the Preliminary detection of obtaining according to frequency spectrum detection module 902 is P-Set as a result, calculates the channel capacity of each frequency spectrum cavity-pocket correspondence respectively, can calculate by Shannon's theorems from the user or from the channel capacity that frequency spectrum cavity-pocket obtained that system uses.Preferably, channel capacity computing module 904 is according to the Preliminary detection result of frequency spectrum cavity-pocket, calculates the channel capacity of frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor; Concrete computational methods just repeat no more here referring to the detailed introduction in the abovementioned steps 204.

Frequency spectrum cavity-pocket evaluation module 906, be used for the channel capacity that receive channel calculation of capacity module 904 sends, according to transmission rate requirements and channel capacity from the user frequency spectrum cavity-pocket is assessed, rejecting can not be satisfied frequency spectrum cavity-pocket from user's transmission rate requirements to obtain the final election result of frequency spectrum cavity-pocket; And the final election result sent to computing module 908 between homogeneity range.For example, according to transmission rate requirements from the user, and the channel capacity of each frequency spectrum cavity-pocket correspondence of channel capacity computing module Practical Calculation, the frequency spectrum cavity-pocket evaluation module is assessed each frequency spectrum cavity-pocket, get rid of from first selected works P-Set thereby can not satisfy from the frequency spectrum cavity-pocket of user's transmission rate requirements, remaining frequency spectrum cavity-pocket is formed the final election result, also can be referred to as final election collection (E-Set, Evolution Set), and with the final election result send to computing module between homogeneity range.

Computing module 908 between homogeneity range, be used for the final election result that received spectrum cavity evaluation module 906 sends, calculating is between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user, and filters out frequency spectrum cavity-pocket in being between homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result; And will screen sub-result and send to frequency spectrum cavity-pocket access module 910.Specifically, for needs switch frequency spectrum cavity-pocket from the user, not only to satisfy from the user transmission rate requirements, need also to guarantee that the target spectrum cavity of switching is close with the frequency of current frequency spectrum cavity-pocket of serving.If the target spectrum cavity differs bigger with the frequency of the frequency spectrum cavity-pocket of current service, path loss model will change, and carry out the frequency spectrum cavity-pocket switching this moment and just may cause the wireless environment estimation of carrying out from the user to produce than big difference.And under the situation that frequency differs greatly before and after the frequency spectrum cavity-pocket switching, factors such as Doppler frequency shift can not be out in the cold.In addition, because the mandate frequency range of main system is that feature such as continuous, the close pairing main user's of frequency spectrum cavity-pocket business, distribution is comparatively approaching probably mostly; Therefore, the reliability of the frequency spectrum cavity-pocket that frequency is close is greater than the reliability of the frequency spectrum cavity-pocket of frequency spectrum apart from each other.Therefore, switching the user takes place to need to carry out the selection of frequency in the process that frequency spectrum cavity-pocket inserts.Preferably, computing module 908 is asked the mode of partial derivative between homogeneity range to frequency by the channel capacity of frequency spectrum cavity-pocket correspondence, perhaps channel capacity by described frequency spectrum cavity-pocket correspondence and mode from the difference of user's transmission rate requirements, calculating is between the residing homogeneity range of the centre frequency of the frequency spectrum cavity-pocket of the current access of user, the concrete computational methods of carrying out just repeat no more here referring to the detailed introduction in the abovementioned steps 208.

Frequency spectrum cavity-pocket access module 910 is used to receive the sub-result of screening that computing module 908 sends between homogeneity range, chooses frequency spectrum cavity-pocket and access slave user from screen sub-result; Preferably, choose the frequency spectrum cavity-pocket of channel capacity minimum, and will be from the frequency spectrum cavity-pocket of user's access channel capacity minimum.For example, the frequency spectrum cavity-pocket access module screens in the end that the suitable frequency spectrum cavity-pocket of selection inserts among the sub-result, and the frequency spectrum cavity-pocket that is inserted can satisfy from the telex network capacity requirement; Through the screening of aforementioned flow process, the child intermediate frequency spectrum as a result of described screening cavity can both be satisfied from the demand of telex network capacity, therefore, selects suitable frequency spectrum cavity-pocket can be understood as and therefrom selects any one frequency spectrum cavity-pocket to switch access.Preferably, implement the most proper selection principle APP-Selection and choose the frequency spectrum cavity-pocket of channel capacity minimum among the sub-result of screening as access cavity from the user.

Frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, carrying out having considered when frequency spectrum inserts that the inhomogeneities of frequency spectrum cavity-pocket is to the influence that brings from telex network, the suitable frequency spectrum cavity-pocket (preferably choosing the frequency spectrum cavity-pocket of channel capacity minimum) of selection inserts from the frequency spectrum cavity-pocket of user's transmission rate requirements satisfying, neither cause the waste of frequency spectrum cavity-pocket capacity, can satisfy transmission rate requirements again from the user.Those skilled in the art can clearly know according to instruction of the present invention, frequency spectrum access scheme based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, help significantly improving the throughput and the availability of frequency spectrum, thereby reduce the cutting off rate from the telex network process greatly from system.

Figure 10 is the structural representation of another embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention.

As shown in figure 10, a kind of frequency spectrum connecting system 1000 based on the frequency spectrum cavity-pocket inhomogeneities comprises: computing module 1008 and frequency spectrum cavity-pocket access module 1010 between frequency spectrum detection module 1002, channel capacity computing module 1004, frequency spectrum cavity-pocket evaluation module 1006, frequency spectrum cavity-pocket switching judging module 1007, homogeneity range.Wherein between frequency spectrum detection module 1002, channel capacity computing module 1004, frequency spectrum cavity-pocket evaluation module 1006, homogeneity range computing module 1008 and frequency spectrum cavity-pocket access module 1010 can be and frequency spectrum detection module 902 shown in Figure 9, channel capacity computing module 904, frequency spectrum cavity-pocket evaluation module 906, homogeneity range between computing module 908 and frequency spectrum cavity-pocket access module 910 have same or analogous functional module.For for purpose of brevity, repeat no more here.

As shown in figure 10, frequency spectrum connecting system 1000 based on the frequency spectrum cavity-pocket inhomogeneities also comprises: frequency spectrum cavity-pocket switching judging module 1007, be used for rejecting and satisfy after the frequency spectrum cavity-pocket of user's transmission rate requirements obtains the final election result of frequency spectrum cavity-pocket, judge whether need to switch frequency spectrum cavity-pocket from the user at frequency spectrum cavity-pocket evaluation module 1006; If need switch frequency spectrum cavity-pocket, then calculate between the homogeneity range of the frequency spectrum cavity-pocket of the current access of user by computing module between homogeneity range from the user; Otherwise, when from the user being the new user (non-switching user) who inserts, then select suitable frequency spectrum cavity-pocket to insert among the E-Set as a result in final election, because the frequency spectrum cavity-pocket that frequency spectrum cavity-pocket evaluation module 1006 will not satisfy capacity requirement has been got rid of, therefore the frequency spectrum cavity-pocket of choosing among the E-Set as a result in final election can both satisfy the transmission rate requirements from the user.Preferably, implement the frequency spectrum cavity-pocket that the most proper selection principle APP-Selection chooses the channel capacity minimum, can either satisfy transmission rate requirements, do not cause the waste of capacity again from the user.

Among the embodiment of the frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities provided by the invention, frequency spectrum cavity-pocket switching judging module is further used between homogeneity range computing module and filters out frequency spectrum cavity-pocket in being between homogeneity range with after the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of frequency spectrum cavity-pocket, judges whether the sub-result of screening is empty set; If screening sub-result is empty set,, and will insert the frequency spectrum cavity-pocket of channel capacity minimum the final election result from the user then by the frequency spectrum cavity-pocket of frequency spectrum cavity-pocket access module selective channel capacity minimum in the final election result of frequency spectrum cavity-pocket; Otherwise, be empty set if screen child Sub-Set as a result, also just mean the frequency spectrum cavity-pocket that does not meet the demands in calculating between resulting homogeneity range through computing module between homogeneity range; The frequency spectrum cavity-pocket of choosing among the E-Set as a result in final election can both satisfy the transmission rate requirements from the user so.Preferably, implement the frequency spectrum cavity-pocket that the most proper selection principle APP-Selection chooses the channel capacity minimum, can either satisfy transmission rate requirements, do not cause the waste of capacity again from the user.

The present invention has paid close attention to the factor that the interference of frequency, communication environments and master-slave system etc. causes the frequency spectrum cavity-pocket inhomogeneities emphatically in the inhomogeneities (frequency spectrum cavity-pocket is by the difference of difference when system uses) of research frequency spectrum cavity-pocket.Calculate the frequency spectrum cavity-pocket capacity and propose new frequency spectrum cavity-pocket allocative decision based on the inhomogeneities of frequency spectrum cavity-pocket, this scheme can be avoided selecting disabled frequency spectrum cavity-pocket and more reasonably distributing detected frequency spectrum cavity-pocket from system effectively, finally improves the availability of frequency spectrum.With reference to the exemplary description of aforementioned the present invention, those skilled in the art can clearly know the present invention and have the following advantages:

The invention discloses a kind of frequency spectrum access method and system based on the frequency spectrum cavity-pocket inhomogeneities, carrying out having considered when frequency spectrum inserts that the inhomogeneities of frequency spectrum cavity-pocket is to the influence that brings from telex network, the suitable frequency spectrum cavity-pocket of selection inserts from the frequency spectrum cavity-pocket of user's transmission rate requirements satisfying, neither cause the waste of frequency spectrum cavity-pocket capacity, can satisfy transmission rate requirements again from the user.

The invention discloses a kind of frequency spectrum access method and system based on the frequency spectrum cavity-pocket inhomogeneities, from satisfying the frequency spectrum cavity-pocket of from the frequency spectrum cavity-pocket of user's transmission rate requirements, choosing the channel capacity minimum, help significantly improving the throughput and the availability of frequency spectrum, thereby reduce the cutting off rate from the telex network process greatly from system.

Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.

Claims (10)

1. the frequency spectrum access method based on the frequency spectrum cavity-pocket inhomogeneities is characterized in that, described method comprises:

Carry out the Preliminary detection result that frequency spectrum detection is obtained frequency spectrum cavity-pocket from the user;

Calculate the channel capacity of described frequency spectrum cavity-pocket correspondence according to the Preliminary detection result of described frequency spectrum cavity-pocket;

Described frequency spectrum cavity-pocket is assessed from user's the transmission rate requirements and the channel capacity of described frequency spectrum cavity-pocket correspondence according to described, the frequency spectrum cavity-pocket that rejecting can not be satisfied described transmission rate requirements from the user obtains the final election result of frequency spectrum cavity-pocket;

Calculate between the homogeneity range of described frequency spectrum cavity-pocket from the current access of user, and from the final election result of described frequency spectrum cavity-pocket, filter out frequency spectrum cavity-pocket in being between described homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket;

From the sub-result of the screening of described frequency spectrum cavity-pocket, choose frequency spectrum cavity-pocket and insert describedly, preferably, choose the frequency spectrum cavity-pocket of channel capacity minimum from the user, and with the described frequency spectrum cavity-pocket that inserts described channel capacity minimum from the user.

2. method according to claim 1, it is characterized in that, described method also comprises: rejecting after the frequency spectrum cavity-pocket can not satisfy described transmission rate requirements from the user obtains the final election result of frequency spectrum cavity-pocket, calculate between the homogeneity range of described frequency spectrum cavity-pocket from the current access of user before; Whether judge describedly needs to switch frequency spectrum cavity-pocket from the user;

If describedly need switch frequency spectrum cavity-pocket, then calculate between the homogeneity range of described frequency spectrum cavity-pocket from the current access of user from the user;

Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of described frequency spectrum cavity-pocket, and insert the frequency spectrum cavity-pocket of channel capacity minimum the described final election result from the user with described.

3. method according to claim 1, it is characterized in that, described method also comprises: from the final election result of described frequency spectrum cavity-pocket, filter out frequency spectrum cavity-pocket in being between described homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket after, from the sub-result of the screening of described frequency spectrum cavity-pocket, choose before the frequency spectrum cavity-pocket of channel capacity minimum; Judge whether the sub-result of described screening is empty set;

If the sub-result of described screening is an empty set, the frequency spectrum cavity-pocket of selective channel capacity minimum in the final election result of described frequency spectrum cavity-pocket then, and insert the frequency spectrum cavity-pocket of channel capacity minimum the described final election result from the user with described;

Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in the sub-result of the screening of described frequency spectrum cavity-pocket, and insert the frequency spectrum cavity-pocket of channel capacity minimum the sub-result of described screening from the user with described.

4. method according to claim 1, it is characterized in that, the step that described Preliminary detection result according to described frequency spectrum cavity-pocket calculates the channel capacity of described frequency spectrum cavity-pocket correspondence further comprises: according to the Preliminary detection result of described frequency spectrum cavity-pocket, calculate the channel capacity of described frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor.

5. method according to claim 1 is characterized in that, the step between the homogeneity range of the described frequency spectrum cavity-pocket from the current access of user of described calculating further comprises:

Frequency is asked the mode of partial derivative by the channel capacity of described frequency spectrum cavity-pocket correspondence, perhaps channel capacity by described frequency spectrum cavity-pocket correspondence and mode from the difference of user's transmission rate requirements are calculated between the residing homogeneity range of centre frequency of described frequency spectrum cavity-pocket from the current access of user.

6. frequency spectrum connecting system based on the frequency spectrum cavity-pocket inhomogeneities is characterized in that described system comprises:

The frequency spectrum detection module is used to carry out frequency spectrum detection, obtains the Preliminary detection result of frequency spectrum cavity-pocket, and described Preliminary detection result is sent to the channel capacity computing module;

Described channel capacity computing module is used to receive the described Preliminary detection result that described frequency spectrum detection module sends, and calculates the channel capacity of described frequency spectrum cavity-pocket correspondence according to described Preliminary detection result; And the channel capacity of described frequency spectrum cavity-pocket correspondence sent to the frequency spectrum cavity-pocket evaluation module;

The frequency spectrum cavity-pocket evaluation module, be used to receive the described channel capacity that described channel capacity computing module sends, according to described transmission rate requirements and described channel capacity from the user described frequency spectrum cavity-pocket is assessed, rejecting can not be satisfied the frequency spectrum cavity-pocket of described transmission rate requirements from the user to obtain the final election result of frequency spectrum cavity-pocket; And described final election result sent to computing module between homogeneity range;

Computing module between described homogeneity range, be used to receive the described final election result that described frequency spectrum cavity-pocket evaluation module sends, calculate between the homogeneity range of described frequency spectrum cavity-pocket from the current access of user, and from described final election result, filter out frequency spectrum cavity-pocket in being between described homogeneity range with the sub-result of the screening of obtaining frequency spectrum cavity-pocket; And the sub-result of described screening sent to the frequency spectrum cavity-pocket access module;

Described frequency spectrum cavity-pocket access module, be used to receive the sub-result of described screening that computing module sends between described homogeneity range, from the sub-result of described screening, choose frequency spectrum cavity-pocket and insert described from the user, preferably, choose the frequency spectrum cavity-pocket of channel capacity minimum, and with the described frequency spectrum cavity-pocket that inserts described channel capacity minimum from the user.

7. system according to claim 6, it is characterized in that, described system also comprises: frequency spectrum cavity-pocket switching judging module, be used for rejecting after the frequency spectrum cavity-pocket that can not satisfy described transmission rate requirements from the user obtains the final election result of frequency spectrum cavity-pocket at described frequency spectrum cavity-pocket evaluation module, whether described final election result, judging describedly needs to switch frequency spectrum cavity-pocket from the user if being sent between homogeneity range before the computing module; If describedly need switch frequency spectrum cavity-pocket, then calculate between the homogeneity range of described frequency spectrum cavity-pocket from the current access of user by computing module between described homogeneity range from the user; Otherwise,, and insert the frequency spectrum cavity-pocket of channel capacity minimum the described final election result from the user with described by the frequency spectrum cavity-pocket of described frequency spectrum cavity-pocket access module selective channel capacity minimum in the final election result of described frequency spectrum cavity-pocket.

8. system according to claim 6, it is characterized in that, described system also comprises: frequency spectrum cavity-pocket switching judging module, be used between described homogeneity range computing module and filter out frequency spectrum cavity-pocket in being between described homogeneity range with after the sub-result of the screening of obtaining frequency spectrum cavity-pocket from the final election result of described frequency spectrum cavity-pocket, the sub-result of described screening is sent to before the frequency spectrum cavity-pocket access module, judge whether the sub-result of described screening is empty set; If the sub-result of described screening is an empty set,, and insert the frequency spectrum cavity-pocket of channel capacity minimum the described final election result from the user with described then by the frequency spectrum cavity-pocket of described frequency spectrum cavity-pocket access module selective channel capacity minimum in the final election result of described frequency spectrum cavity-pocket; Otherwise, the frequency spectrum cavity-pocket of selective channel capacity minimum in by the sub-result of screening of the described frequency spectrum cavity-pocket of described frequency spectrum cavity-pocket access module, and insert the frequency spectrum cavity-pocket of channel capacity minimum the sub-result of described screening from the user with described.

9. system according to claim 6 is characterized in that, described channel capacity computing module is further used for the Preliminary detection result according to described frequency spectrum cavity-pocket, calculates the channel capacity of described frequency spectrum cavity-pocket correspondence in conjunction with frequency factor and communication environments factor.

10. system according to claim 6, it is characterized in that, computing module is further used for by the channel capacity of described frequency spectrum cavity-pocket correspondence frequency being asked the mode of partial derivative between described homogeneity range, perhaps channel capacity by described frequency spectrum cavity-pocket correspondence and mode from the difference of user's transmission rate requirements are calculated between the residing homogeneity range of centre frequency of described frequency spectrum cavity-pocket from the current access of user.

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